<template>
  <div class="app-container">
    <el-input v-model="filterText" placeholder="Filter keyword" style="margin-bottom:30px;"/>

    <el-tree
      ref="tree2"
      :data="data2"
      :props="defaultProps"
      :filter-node-method="filterNode"
      class="filter-tree"
      default-expand-all
    />

  </div>

</template>

<script>
import subject from "../../../api/edu/subject";

export default {
  name: 'list',
  props: {},
  components: {},
  data() {
    return {
      filterText: '',
      data2: [],//返回所有分类数据
      defaultProps: {
        children: 'children',
        label: 'title'
      }
    }
  },
  created() {//写方法，方法的内容在method中具体写，这里是调用方法
    this.getAllSubjectList()
  },
  watch: {
    filterText(val){
      this.$refs.tree2.filter(val)
    }
  },
  methods: {
    getAllSubjectList() {
      subject.getSubjectList()
        .then(response => {
          this.data2 = response.data.list
        })
    },
    filterNode(value,data){
      if(!value){
        return true;
      }
      else {
        return data.title.toLowerCase().indexOf(value.toLowerCase()) !==-1
      }
    }
  }
}
</script>

<style scoped>

</style>
